<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>用户管理</el-breadcrumb-item>
            <el-breadcrumb-item>用户列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区 -->
        <el-card>
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>
            <!-- 角色列表区 -->
            <el-table :data="rolesList" border stripe>
              <!-- 展开 -->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <el-row :class="['bdbottom', i1 == 0 ? 'bdtop' : '', 'vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                    <!-- 一级权限 -->
                    <el-col :span="5">
                      <el-tag closable @close="removeRightById(scope.row, item3.id)">{{item1.authName}}</el-tag>
                      <i class="el-icon-caret-right"></i>
                    </el-col>
                    <!-- 二级和三级权限 -->
                    <el-col :span="19">
                      <!-- 通过 for 循环，渲染二级权限 -->
                      <el-row :class="[i2 == 0 ? '' : 'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                        <el-col :span="6">
                          <el-tag type="success" closable @close="removeRightById(scope.row, item3.id)">{{item2.authName}}</el-tag>
                          <i class="el-icon-caret-right"></i>
                        </el-col>
                        <el-col :span="18">
                          <el-tag type="warning" v-for="(item3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">{{item3.authName}}</el-tag>
                        </el-col>
                      </el-row>
                    </el-col>
                  </el-row>
                  <!-- <pre> -->
                    <!-- {{ scope.row }} -->
                  <!-- </pre> -->
                </template>
              </el-table-column>
              <!-- 索引 -->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="角色名称" prop="roleName"></el-table-column>
              <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
              <el-table-column label="操作" width="300px">
                <template slot-scope="scope">
                  <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                  <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                  <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                </template>
              </el-table-column>
            </el-table>
        </el-card>
        <!-- 分配权限对话框 -->
        <el-dialog
          title="分配权限"
          :visible.sync="setRightDialogVisible"
          width="50%" @close="setRightsDialogClosed">
          <!-- 树形控件 -->
          <el-tree :data="rightsList" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defaultKeys" ref="treeRef"></el-tree>
          <span slot="footer" class="dialog-footer">
            <el-button @click="setRightDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="allotRights">确 定</el-button>
          </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
  data () {
    return {
      // 角色列表
      rolesList: [],
      // 控制权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // 所有权限数据
      rightsList: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认配置的权限
      defaultKeys: [],
      // 当前操作的角色id
      roleId: ''
    }
  },
  created () {
    this.getRolesList()
  },
  methods: {
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败')
      }
      this.rolesList = res.data
      console.log(this.rolesList)
    },
    async removeRightById (role, rightId) {
      // 弹窗提示确认删除
      await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        const { data: res } = this.$http.delete(`roles/${role.id}/rights/${rightId}`)
        if (res.meta.status !== 200) {
          return this.$message.error(res.msg)
        }
        this.$message({
          type: 'success',
          message: '删除成功!'
        })
        // 刷新这个角色的权限
        role.children = res.data
      }).catch(() => {
        this.$message({
          type: 'info',
          message: '已取消删除'
        })
      })
    },
    // 展示分配权限的对话框
    async showSetRightDialog (role) {
      this.roleId = role.id
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        this.$message.error(res.meta.msg)
      }
      this.rightsList = res.data
      this.getLeafKeys(role, this.defaultKeys)
      this.setRightDialogVisible = true
    },
    // 通过递归的形式展示角色下所有的三级权限
    getLeafKeys (node, arr) {
      // 如果当前节点不包含children属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(element => {
        this.getLeafKeys(element, arr)
      })
    },
    // 关闭分配权限对话框的时候，将defaultKeys重置
    setRightsDialogClosed () {
      this.defaultKeys = []
    },
    // 点击确定，为角色分配权限
    async allotRights () {
      const keys = [
        // 利用展开运算符，将数组中的值添加到数组中
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.$message.success('分配权限成功')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}
.bdtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}
.vcenter {
  display: flex;
  align-items: center;
}
</style>
